Victoria Zylstra Lopez, MD
NPI 1255900585ActiveIndividual· Internal Medicine· Porterville, CA
Internal Medicine (MD) with Hospitalists of Modesto Medical Group Inc, practicing in Porterville, California. Their prescriptions cost Medicare Part D more than their services did: $10,080 for 153 claims, against $5,460 paid for services in 2024. Merck Sharp & Dohme LLC reported $36.38 in payments in 2025, mostly food and beverage. Lists Doctors Hospital of Manteca and 3 other hospitals as hospital affiliations.
Overview
| NPI | 1255900585 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Jun 21, 2021 |
| Last updated in NPPES | Mar 21, 2024 |
| Certified by provider | Mar 21, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | A191603 | CA |
| General Practice | 208D00000X | A191603 | CA |
| Student in an Organized Health Care Education/Training Program | 390200000X | — | — |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - General Practice (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 33 |
|---|---|
| Services billed | 55 across 8 procedure codes |
| Paid by Medicare | $5,460 |
Part D prescriptions in 2024
| Prescriptions (claims) | 153 · 158 30-day fills |
|---|---|
| Patients | 57 |
| Total drug cost | $10,080 |
| Generic share | 87% of claims |
Education and affiliations
| Graduation year | 2021 |
|---|---|
| Medicare specialty | General Practice |
| Secondary specialties | Internal Medicine |
Medical group
- Hospitalists of Modesto Medical Group IncModesto, CA · 85 clinicians
Hospital affiliations
- Doctors Hospital of MantecaManteca, CA
- Emanuel Medical CenterTurlock, CA
- John C Fremont Healthcare DistrictMariposa, CA
- Mercy Medical CenterMerced, CA
Industry payments (Open Payments)
- 2025$36.38 · 2 payments from 1 company
- 2024$59.80 · 3 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Merck Sharp & Dohme LLC | $36.38 | 2 |
What the 2025 payments were for
- Food and Beverage$36.38 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 37 internal medicine physicians in Porterville · All internal medicine physicians in California